The company in a statement said as the western region head he will took after five states -- Maharashtra, Gujarat, Madhya Pradesh, Goa and Chattisgarh.
"He brings with him more than three decades of rich and diverse experience in IOC," the statement said.
A graduate in Chemical Engineering from Jadavpur University, Kolkata, Sen as Executive Director (Regional Services) will head various service functions like supply and distribution, quality control, maintenance, including HR, Finance and allied services at the regional level.